Rain water drainage device

Abstract

To provide a rain water drainage device allowing the siphon phenomenon to be generated more reliably.SOLUTION: A rain water drainage device 10 is provided with an inflow port 11, a vertical piping part 13, a lateral piping part 14, and a siphon generating part 12. Rain water flows into the inflow port 11. The vertical piping part 13 is connected to the inflow port 11 and arranged in a vertical direction. The lateral piping part 14 is connected to the vertical piping part 13 at a joint part 51 and arranged along a lateral direction. A length L of the vertical piping part 13 from the joint part 51 to the inflow port 11 is equal to or longer than 60 cm. A pipe outer diameter of the vertical piping part 13 is from 60 mm or more to 114 mm or less. The siphon generating part 12 comprises a plurality of fins 43 for rectification placed in a radial direction of the vertical piping part 13.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a rainwater drainage device for draining rainwater. [Background technology]

[0002] Conventionally, a configuration has been proposed for improving the efficiency of draining rainwater by inducing a siphon phenomenon (see, for example, Patent Document 1).

[0003] For example, in the configuration shown in Patent Document 1, the siphoning phenomenon is induced by a siphon pipe formed of an elbow joint, a round gutter, or the like, arranged below the eaves gutter of a house. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4130616 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in tall structures such as buildings, the pipes for draining rainwater are generally placed inside the structure, so vertical pipes that carry the rainwater down to the ground must be run in restricted locations such as inside walls or pillars.

[0006] For this reason, it may be necessary to guide rainwater from the inlet on the roof to the vertical pipe through a horizontal pipe; however, depending on the length of the horizontal pipe, it may become difficult for the siphon phenomenon as described in Patent Document 1 to occur.

[0007] An object of the present invention is to provide a rainwater drainage device that can more reliably produce the siphon phenomenon. [Means for solving the problem]

[0008] In order to achieve the above object, a rainwater drainage device according to a first aspect of the present invention includes an inlet, a first piping section, and a second piping section. Rainwater flows into the inlet. The first piping section is connected to the inlet and arranged along the vertical direction. The second piping section is connected to the first piping section at a first connection section and arranged along the horizontal direction. The length of the first piping section from the first connection section to the inlet is 60 cm or more.

[0009] In this way, by setting the length from the inlet of the vertically arranged first piping section to the second piping section to 60 cm or more, it is possible to ensure a length of the second piping section that is applicable to buildings and other structures while still allowing the siphon phenomenon to occur.

[0010] Therefore, in a configuration that can be applied even inside a building, the siphon effect can be more reliably generated.

[0011] In this specification, the term "vertical direction" does not mean in a strict sense, but rather in a range that can be recognized as a vertical direction according to social conventions, and may include an inclination. Similarly, the term "horizontal direction" does not mean in a strict sense, but rather in a range that can be recognized as a horizontal direction according to social conventions, and may include an inclination.

[0012] A rainwater drainage device according to a second aspect of the present invention is the rainwater drainage device according to the first aspect of the present invention, wherein a plurality of inlets, a plurality of first piping sections, and a plurality of first connection sections are provided, and the interval between adjacent first connection sections is 15 m or less.

[0013] In this way, when rainwater flows into the second piping section from a plurality of inlets, the siphon effect can be generated by setting the length between the first connecting sections to 15 m or less.

[0014] The rainwater drainage apparatus according to the third aspect of the present invention is the rainwater drainage apparatus according to the second aspect of the present invention, further comprising a third piping section. The third piping section is connected to the second piping section at the second connection section and is disposed vertically below the second piping section. The length of the second piping section from the second connection section to the first connection section closest to the second connection section is 15 m or less.

[0015] In this way, even if rainwater flows into the second piping section from multiple inlets, the siphon effect can be generated by setting the length between the second connection section and the first connection section closest to the second connection section to 15 m or less.

[0016] The rainwater drainage apparatus according to a fourth aspect of the present invention is the rainwater drainage apparatus according to the first aspect of the present invention, further comprising a third piping section. The third piping section is connected to the second piping section at the second connection section and is disposed vertically below the second piping section. The length of the third piping section from the second connection section to the first connection section is 15 m or less.

[0017] In this way, when rainwater flows into the second piping section from one inlet, the siphon effect can be generated by setting the length between the first connecting sections to 15 m or less.

[0018] A rainwater drainage device according to a fifth aspect of the present invention is the rainwater drainage device according to any one of the first to fourth aspects of the present invention, further comprising a siphon induction part. The siphon induction part is disposed at the inlet and induces the siphon phenomenon.

[0019] This makes it possible to more reliably cause the siphon phenomenon. Effect of the Invention

[0020] According to the present invention, it is possible to provide a rainwater drainage device that can more reliably cause the siphon phenomenon to occur. [Brief description of the drawings]

[0021] [Figure 1] 1 is a schematic diagram showing a configuration of a storm water drainage system according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view of the storm water drainage system of FIG. 1 near the inlet. [Diagram 3]3(a) is a front view showing the configuration of a siphon inducer in the drainage device of FIG. 2, and FIG. 3(b) is a plan view of the siphon inducer in FIG. 3(a). [Figure 4] Schematic diagram of the storm water drainage system in Figure 1. [Diagram 5] FIG. 1 is a table showing the results of Examples 1 to 8 and Comparative Examples 1 to 7. [Figure 6] FIG. 11 is a schematic diagram of a rainwater drainage device according to a modified example of an embodiment of the present invention. [Figure 7] FIG. 11 is a schematic diagram of a rainwater drainage device according to a modified example of an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] A rainwater drainage device 10 according to an embodiment of the present invention will be described with reference to the drawings.

[0023] <1. Configuration> FIG. 1 is a diagram showing the configuration of a rainwater drainage device 10 according to the present embodiment.

[0024] A rainwater drainage device 10 of this embodiment constitutes a part of a rainwater drainage system 1 installed in a building 100, as shown in FIG.

[0025] The building 100 is, for example, a three-story building, with slabs 101 provided between the first and second floors and between the second and third floors.

[0026] (Rainwater drainage system 1) The storm water drainage system 1 moves rainwater that has fallen on the roof 105 of the building 100 to the vicinity of the ground and drains it into a sewer pipe. As shown in Fig. 1, the storm water drainage system 1 includes two storm water drainage devices 10. The two storm water drainage devices 10 are disposed near opposite side surfaces 103 and 104 of the building 100.

[0027] (Rainwater drainage system 10) The rainwater drainage device 10 has a plurality of inlets 11, a plurality of siphon induction sections 12, a plurality of vertical pipe sections 13, a horizontal pipe section 14, a vertical pipe section 15, and a drainage section 16.

[0028] (Inlet 11) The inflow port 11 is an opening formed in the rooftop 105, through which rainwater that has fallen onto the rooftop 105 flows.

[0029] 2 is a side cross-sectional view showing the inlet 11 and a siphon inducer 12 described later. The inlet 11 shown in FIG. 2 is the inlet 11 farthest from the vertical piping portion 15 of the two inlets 11.

[0030] As shown in FIG. 2, the inlet 11 is formed in a bottom surface 102a of a recess 102 formed in a rooftop 105.

[0031] In this embodiment, each rainwater drainage device 10 has two inlets 11. The two inlets 11 of one rainwater drainage device 10 are arranged side by side along an edge 105a of the rooftop 105. The two inlets 11 of the other rainwater drainage device 10 are arranged side by side along an edge 105b opposite the edge 105a of the rooftop 105. That is, four inlets 11 are provided on the rooftop 105, and the two inlets 11 provided on each rainwater drainage device 10 are arranged along the opposite edges 105a, 105b of the rooftop 105.

[0032] The ends 105a and 105b of the rooftop 105 may be inclined toward either one of the directions along the ends. The rooftop 105 may also be inclined from the center toward the ends 105a and 105b.

[0033] In this embodiment, the inlet 11 is formed in the bottom surface 102a of a recess 102 formed in the rooftop 105, but it may be formed directly in the rooftop 105 without providing the recess 102.

[0034] (Siphon Inducer 12) The siphon inducer 12 is disposed so as to block the inlet 11, as shown in FIG.

[0035] Examples of materials that can be used for siphon inducing portion 12 include olefin resins such as PE (polyethylene) and PP (polypropylene), PVC resins, and metals such as aluminum, aluminum alloys, and stainless steel.

[0036] By using resin, aluminum, or an aluminum alloy, a siphon inducer 12 having a desired shape can be obtained, which is lightweight and low cost.

[0037] FIG. 3(a) is a plan view of the siphon inducer 12, and FIG. 3(b) is a cross-sectional view taken along line AA' in FIG. 3(a).

[0038] The siphon inducer 12 has a base portion 41 , a lid portion 42 , and flow straightening fins 43 .

[0039] As shown in Figures 3(a) and 3(b), the base portion 41 has an annular bottom surface 41a, a drop port 41b formed at approximately the center of the bottom surface 41a for dropping rainwater, and a cylindrical portion 41c. The drop port 41b is formed at the upper end of the cylindrical portion 41c. The cylindrical portion 41c is disposed in the vertical pipe portion 13.

[0040] 3(a) and 3(b), the bottom surface 41a is an annular member having a drop opening 41b formed in the approximate center portion. A plurality of flow straightening fins 43 are arranged at equal angular intervals on the annular bottom surface 41a, centered on the drop opening 41b.

[0041] 3(a), the drop outlet 41b is a through hole formed in the center of the base portion 41, and is formed inside the cylindrical portion 41c. The drop outlet 41b communicates with the upper end portion of the vertical pipe portion 13, and drops rainwater that has flowed into the siphon inducer portion 12 from 360 degrees into the vertical pipe portion 13.

[0042] 3(a) and 3(b), the tubular portion 41c is a cylindrical member, and is connected at its upper end to the bottom surface 41a and formed so as to protrude downward from the bottom surface 41a. The tubular portion 41c has a drop opening 41b formed therein.

[0043] 3(a) and 3(b), the lid portion 42 is a circular plate-like member arranged above the base portion 41 concentrically with a drop opening 41b formed at the center of the base portion 41, and is supported by a plurality of straightening fins 43 erected on the bottom surface 41a of the base portion 41. Furthermore, as shown in FIG. 3(b), the lid portion 42 is arranged above the base portion 41 (drop opening 41b) with a predetermined gap G (height) from the bottom surface 41a.

[0044] As shown in Figures 3(a) and 3(b), the plurality of flow straightening fins 43 are provided on the bottom surface 41a of the base portion 41 in order to straighten the flow of rainwater flowing into the drop opening 41b. More specifically, as shown in Figure 3(a), the plurality of flow straightening fins 43 are plate-shaped members arranged along a substantially vertical direction, and eight of the flow straightening fins 43 are provided at equal angular intervals on the circumference of a circle centered on the drop opening 41b on the bottom surface 41a.

[0045] The eight flow straightening fins 43 are arranged in the radial direction on the annular bottom surface 41a.

[0046] As a result, even if rainwater flows into the gap G between the bottom surface 41a of the base portion 41 and the lid portion 42 in a vortex shape (see the dotted line in the figure) as shown in Figure 3(a), the rainwater can be straightened by the straightening fins 43 and guided toward the center of the drop outlet 41b.

[0047] This makes it possible to prevent rainwater from flowing in a vortex into the vertical pipe section 13 and forming an air column in the center.

[0048] As a result, the straightening fin 43 prevents an air column from forming in the center of the rainwater flowing into the drop outlet 41b, thereby effectively eliminating factors that hinder the occurrence of the siphon phenomenon within the vertical piping section 13.

[0049] (Vertical piping section 13) FIG. 4 is a schematic diagram of the rainwater drainage device 10. As shown in FIG.

[0050] The vertical pipe section 13 is disposed downward from each of the two inlets 11. As shown in Fig. 2, the vertical pipe section 13 has a pipe 21. The pipe 21 is a tubular member made of PE (polyethylene), and is disposed along a substantially vertical direction (which can also be said to be an up-down direction) as shown in Fig. 2.

[0051] An upper end of the pipe 21 (which can also be called an upper end 13a of the vertical pipe section 13) is connected to the edge of the inlet 11 from below, and is connected to the inlet 11. A lower end of the pipe 21 (which can also be called a lower end of the vertical pipe section 13) is connected to the horizontal pipe section 14.

[0052] For example, pipes with nominal diameters of 50A, 75A, 100A, 125A, 150A, 200A, etc. are used as the pipes 21. The inner diameter is determined for each nominal diameter for each type of pipe. In this embodiment, the material of the pipes is, for example, polyethylene, but is not limited thereto, and for example, polyvinyl chloride may be used.

[0053] The length L from the inlet 11 of the vertical piping section 13 to the horizontal piping section 14 is set to 60 cm or more. In other words, the length L from the inlet 11 of the vertical piping section 13 to the connection sections 51 and 52 described later is set to 60 cm or more.

[0054] In this embodiment, the vertical pipe section 13 has one pipe 21, but may have a plurality of pipes 21 and joints connecting the pipes 21 with each other.

[0055] (Horizontal piping section 14) The horizontal piping section 14 is disposed horizontally and is connected to the lower ends of the two vertical piping sections 13. The vertical piping section 15, which will be described later, is connected to the end of the horizontal piping section 14. Although not shown in the figure, the horizontal piping section 14 is disposed at a slight incline so that the end on the vertical piping section 15 side is lower than the opposite end, and rainwater flowing in from the two vertical piping sections 13 is moved toward the vertical piping section 15.

[0056] 4 is a diagram showing the configuration of the horizontal piping section 14. The horizontal piping section 14 has an elbow joint 31, a first pipe 32, a three-way joint 33, a second pipe 34, and an elbow joint 35, which are arranged in this order along the horizontal direction.

[0057] One end of the first pipe 32 is connected to the lower end of the vertical pipe section 13 farther from the vertical pipe section 15 by an elbow joint 31. The other end of the first pipe 32 is connected to a three-way joint 33. The three-way joint 33 is connected to the lower end of the vertical pipe section 13 closer to the vertical pipe section 15 of the two vertical pipe sections 13 and one end of a second pipe 34. The other end of the second pipe 34 is connected to the upper end of the vertical pipe section 15 via an elbow joint 35.

[0058] Here, the connection parts of the two vertical pipe sections 13 to the horizontal pipe section 14 are designated as 51 and 52, and the connection part of the horizontal pipe section 14 to the vertical pipe section 15 is designated as 53, as shown in FIG. 4. Connection part 51 is disposed far from the vertical pipe section 15, and connection part 52 is disposed close to the vertical pipe section 15. Furthermore, if the distance of the horizontal pipe section 14 between connection parts 51 and 52 is designated as Y, and the distance of the horizontal pipe section 14 between connection parts 52 and 53 is designated as W, then Y and W are set to 15 m or less.

[0059] That is, the distance between adjacent connections 51, 52 is set to 15 m or less. Also, the distance of horizontal piping section 14 from connection 53 with vertical piping section 15 to the nearest connection 52 is set to 15 m or less.

[0060] For the first pipe 32 and the second pipe 34, pipes with nominal diameters of, for example, 50A, 75A, 100A, 125A, 150A, 200A, etc. are used. The inner diameter is determined for each nominal diameter for each type of pipe. In this embodiment, the material of the pipe is, for example, polyethylene, but is not limited thereto, and for example, polyvinyl chloride may be used. Furthermore, the first pipe 32 and the second pipe 34 may have the same nominal diameter, or may have different nominal diameters. For example, the first pipe 32 and the second pipe 34 may have larger nominal diameters in that order.

[0061] (Vertical piping section 15) The vertical piping section 15 is disposed along the vertical direction, and its upper end is connected to the horizontal piping section 14 at a connection section 53. The vertical piping section 15 is disposed so as to penetrate the slab 101.

[0062] As shown in FIG. 4, the vertical pipe section 15 has a first pipe 61, a joint 62, and a second pipe 63. The upper end of the first pipe 61 is connected to the elbow joint 35. The lower end of the first pipe 61 is connected to the joint 62. The joint 62 is a reducer and a tubular member. The upper end of the second pipe 63 is connected to the joint 62. The lower end of the second pipe 63 is connected to the drain section 16. In this embodiment, the first pipe 61 and the second pipe 63 are made of, for example, polyethylene, but this is not limited thereto, and polyvinyl chloride may be used, for example. The joint 62 is made of polyethylene.

[0063] The first pipe 61 may have a nominal diameter of, for example, 75A, 100A, 125A, 150A, or 200A. The second pipe 63 may have a nominal diameter of, for example, 50A, 65A, 75A, 100A, 125A, or 150A. The first pipe 61 and the second pipe 63 may have the same nominal diameter, but the first pipe 61 is preferably a pipe having a nominal diameter larger than that of the second pipe 63. For example, when the second pipe 63 has a nominal diameter of 75A, the first pipe 61 may have a nominal diameter of 100A.

[0064] In this way, by using fitting 62 (reduced diameter section) to make the first pipe 61 a pipe with a larger nominal diameter than the second pipe 63, the pressure is relieved, thereby suppressing the occurrence of cavitation, and the effect of reducing the nominal diameter is to increase resistance to flow, thereby reducing the sound of water impacting near the ground.

[0065] (Drainage section 16) The drainage section 16 is connected to the lower end of the vertical pipe section 15, and drains rainwater to the outside of the building 100. The drainage section 16 has an elbow joint 71 and a pipe 72. The elbow joint 71 is connected to the lower end of the second pipe 63. The pipe 72 is connected to the elbow joint 71. The pipe 72 extends from the inside to the outside of the building 100, and is connected to a rainwater manhole (not shown). Rainwater that has fallen through the vertical pipe section 15 is drained to the outside of the building 100 through the pipe 72, and is drained to a sewer pipe via a rainwater manhole (not shown).

[0066] <2. Effect> Rainwater that falls on the roof 105 of the building 100 flows into the recess 102, passes through the siphon inducer 12 disposed at the inlet 11, and flows into the piping 21. Here, the siphon phenomenon occurs, filling the vertical piping section 13, allowing a large amount of rainwater to be drained.

[0067] Rainwater flowing in from the multiple inlets 11 falls down the vertical pipe section 13, flows into the horizontal pipe section 14, and then flows into the vertical pipe section 15. Here, the pressure is alleviated by making the first pipe 61 a pipe with a larger nominal diameter than the second pipe 63. This reduces the occurrence of cavitation.

[0068] Rainwater that falls down the vertical pipe section 15 is guided to the outside of the building 100 through the drainage section 16 and drained into the sewer pipe via a rainwater manhole.

[0069] <3. Examples> In the present embodiment, Examples 1 to 8 and Comparative Examples 1 to 7 are shown in which the lengths L, Y and W of the rainwater drainage device 10 are changed.

[0070] 5 is a table showing Examples 1 to 8 and Comparative Examples 1 to 7. When water was drained from the recess 102, it was confirmed whether the water flowed down without increasing in depth within the recess 102, and if the water flowed down, it was indicated as good (◯), and if the water level rose without flowing down, it was indicated as poor (×).

[0071] Example 1 In Example 1, a polyethylene pipe 21 with a nominal diameter of 50A was used, the size of the inlet 11 was 50A, the outer diameter of the pipe 21 was 60mm, the pipe 32 was 50A, the pipe 34 was 65A, L was set to 0.6m, Y was 1m, W was set to 15m, the pipe 61 was 65A (reference: length 2m), the pipe 63 was reduced in diameter by a joint 62 to 50A, and a drainage experiment was performed at a flow rate of 10L / s. The result was that the water did not rise in the recess 102 and flowed down well (◯).

[0072] Example 2 In Example 2, a polyethylene pipe 21 with a nominal diameter of 50A was used, the size of the inlet 11 was 50A, the outer diameter of the pipe 21 was 60mm, the pipe 32 was 65A, the pipe 34 was 65A, L was set to 0.6m, Y to 15m, W to 1m, the pipe 61 was 65A (reference: length 2m), the pipe 63 was reduced in diameter by a joint 62 to 50A, and a drainage experiment was performed at a flow rate of 10L / s. The result was that the water did not rise in the recess 102 and flowed down well (◯).

[0073] Example 3 In Example 3, a polyethylene pipe 21 with a nominal diameter of 50A was used, the size of the inlet 11 was 50A, the outer diameter of the pipe 21 was 60mm, the pipe 32 was 65A, the pipe 34 was 65A, L was set to 0.6m, Y was set to 15m, W was set to 15m, the pipe 61 was 65A (reference: length 2m), the pipe 63 was reduced in diameter by a joint 62 to 50A, and a drainage experiment was performed at a flow rate of 10L / s. The result was that the water did not rise in the recess 102 and flowed down well (◯).

[0074] Example 4 In Example 4, a polyethylene pipe 21 with a nominal diameter of 75A was used, the size of the inlet 11 was 75A, the outer diameter of the pipe 21 was 89mm, the pipe 32 was 100A, the pipe 34 was 100A, L was set to 0.6m, Y to 15m, W to 1m, the pipe 61 was 100A (reference: length 2m), the pipe 63 was reduced in diameter by a joint 62 to 100A, and a drainage experiment was performed at a flow rate of 30L / s. The result was that the water did not rise in the recess 102 and flowed down well (◯).

[0075] Example 5 In Example 5, a polyethylene pipe 21 with a nominal diameter of 75A was used, the size of the inlet 11 was 75A, the outer diameter of the pipe 21 was 89mm, the pipe 32 was 100A, the pipe 34 was 100A, L was set to 0.6m, Y was 1m, W was set to 15m, the pipe 61 was 100A (reference: length 2m), the pipe 63 was reduced in diameter by a joint 62 to 100A, and a drainage experiment was performed at a flow rate of 30L / s. The result was that the water did not rise in the recess 102 and flowed down well (◯).

[0076] Example 6 In Example 6, a polyethylene pipe 21 with a nominal diameter of 100A was used, the size of the inlet 11 was 75A, the outer diameter of the pipe 21 was 114mm, the pipe 32 was 125A, the pipe 34 was 125A, L was set to 0.6m, Y was set to 15m, W was set to 1m, the pipe 61 was 125A (reference: length 1m), the pipe 63 was reduced in diameter by a joint 62 to 100A, and a drainage experiment was performed at a flow rate of 50L / s. The result was that the water did not rise in the recess 102 and flowed down well (◯).

[0077] Example 7 In Example 7, a polyethylene pipe 21 with a nominal diameter of 100A was used, the size of the inlet 11 was 75A, the outer diameter of the pipe 21 was 114mm, the pipe 32 was 125A, the pipe 34 was 125A, L was set to 0.6m, Y was set to 1m, W was set to 15m, the pipe 61 was 125A (reference: length 1m), the pipe 63 was reduced in diameter at the joint 62 to 100A, and a drainage experiment was performed at a flow rate of 50L / s. The result was that the water did not rise in the recess 102 and flowed down well (◯).

[0078] Example 8 In Example 8, a polyethylene pipe 21 with a nominal diameter of 75A was used, the size of the inlet 11 was 75A, the outer diameter of the pipe 21 was 89mm, the pipe 32 was 100A, the pipe 34 was 100A, L was set to 0.6m, Y was set to 15m, W was set to 15m, the pipe 61 was 100A (reference: length 2m), the pipe 63 was reduced in diameter by the joint 62 to 100A, and a drainage experiment was performed at a flow rate of 30L / s. The result was that the water did not rise in the recess 102 and flowed down well (◯).

[0079] Comparative Example 1 In Comparative Example 1, a polyethylene pipe 21 with a nominal diameter of 50A was used, the size of the inlet 11 was 50A, the outer diameter of the pipe 21 was 60mm, the pipe 32 was 65A, the pipe 34 was 65A, L was set to 0.6m, Y was set to 16m, W was set to 16m, the pipe 61 was 65A (reference: length 2m), the pipe 63 was reduced in diameter at the joint 62 to 50A, and a drainage experiment was performed at a flow rate of 10L / s. The result was that the water depth increased in the recess 102 and drainage was poor (×).

[0080] Comparative Example 2 In Comparative Example 2, a polyethylene pipe 21 with a nominal diameter of 75A was used, the size of the inlet 11 was 75A, the outer diameter of the pipe 21 was 89mm, the pipe 32 was 100A, the pipe 34 was 100A, L was set to 0.6m, Y to 16m, W to 16m, the pipe 61 was 100A (reference: length 2m), the pipe 63 was reduced in diameter at the joint 62 to 100A, and a drainage experiment was performed at a flow rate of 30L / s. The result was that the water depth increased in the recess 102 and drainage was poor (x).

[0081] Comparative Example 3 In Comparative Example 3, a polyethylene pipe 21 with a nominal diameter of 75A was used, the size of the inlet 11 was 75A, the outer diameter of the pipe 21 was 89mm, the pipe 32 was 100A, the pipe 34 was 100A, L was set to 0.5m, Y to 15m, W to 15m, the pipe 61 was 100A (reference: length 2m), the pipe 63 was reduced in diameter at the joint 62 to 100A, and a drainage experiment was performed at a flow rate of 30L / s. The result was that the water depth increased in the recess 102 and drainage was poor (x).

[0082] Comparative Example 4 In Comparative Example 4, a polyethylene pipe 21 with a nominal diameter of 100A was used, the size of the inlet 11 was 75A, the outer diameter of the pipe 21 was 89mm, the pipe 32 was 100A, the pipe 34 was 100A, L was set to 0.6m, Y was set to 16m, W was set to 16m, the pipe 61 was 125A (reference: length 1m), the pipe 63 was reduced in diameter at the joint 62 to 100A, and a drainage experiment was performed at a flow rate of 50L / s. The result was that the water depth increased in the recess 102 and drainage was poor (×).

[0083] Comparative Example 5 In Comparative Example 5, a polyethylene pipe 21 with a nominal diameter of 100A was used, the size of the inlet 11 was 75A, the outer diameter of the pipe 21 was 89mm, the pipe 32 was 100A, the pipe 34 was 100A, L was set to 0.5m, Y was set to 15m, W was set to 15m, the pipe 61 was 125A (reference: length 1m), the pipe 63 was reduced in diameter at the joint 62 to 100A, and a drainage experiment was performed at a flow rate of 50L / s. As a result, the water depth increased in the recess 102, and drainage was poor (×).

[0084] Comparative Example 6 In Comparative Example 6, a polyethylene pipe 21 with a nominal diameter of 75A was used, the size of the inlet 11 was 75A, the outer diameter of the pipe 21 was 89mm, the pipe 32 was 100A, the pipe 34 was 100A, L was set to 0.6m, Y to 16m, W to 1m, the pipe 61 was 100A (reference: length 2m), the pipe 63 was reduced in diameter by a joint 62 to 100A, and a drainage experiment was performed at a flow rate of 30L / s. As a result, the water depth increased in the recess 102, and drainage was poor (×).

[0085] Comparative Example 7 In Comparative Example 7, a polyethylene pipe 21 with a nominal diameter of 75A was used, the size of the inlet 11 was 75A, the outer diameter of the pipe 21 was 89mm, the pipe 32 was 100A, the pipe 34 was 100A, L was set to 0.6m, Y was 1m, W was set to 16m, the pipe 61 was 100A (reference: length 2m), the pipe 63 was reduced in diameter by a joint 62 to 100A, and a drainage experiment was performed at a flow rate of 30L / s. As a result, the water depth increased in the recess 102, and drainage was poor (×).

[0086] From Example 8 and Comparative Example 3, it is understood that drainage is improved by setting the distance L from the inlet 11 to the horizontal piping portion 14 to 60 cm or more.

[0087] Moreover, from Example 8 and Comparative Example 6, it is understood that drainage is improved by setting the interval Y between adjacent connecting portions 51, 52 to 15 m or less.

[0088] Moreover, from Example 8 and Comparative Example 7, it can be seen that drainage is improved by setting the length W of the horizontal piping section 14 to the connection section 52 closest to the connection section 53 to 15 m or less.

[0089] <4. Features etc.> (1) The rainwater drainage device 10 of this embodiment includes an inlet 11, a vertical pipe section 13 (an example of a first pipe section), and a horizontal pipe section 14 (an example of a second pipe section). Rainwater flows into the inlet 11. The vertical pipe section 13 is connected to the inlet 11 and arranged along the vertical direction. The horizontal pipe section 14 is connected to the vertical pipe section 13 at connections 51 and 52 (an example of a first connection section) and arranged along the horizontal direction. The length L of the vertical pipe section 13 from the connection section 51 to the inlet 11 and the length L of the vertical pipe section 13 from the connection section 52 to the inlet 11 are 60 cm or more.

[0090] In this way, by setting the length L from the inlet 11 of the vertically arranged vertical piping section 13 to the horizontal piping section 14 to 60 cm or more, it is possible to ensure a length of the horizontal piping section 14 that is applicable to buildings and other structures while still allowing the siphon phenomenon to occur.

[0091] Therefore, in a configuration that can be applied even inside a building, the siphon effect can be more reliably generated.

[0092] In this specification, the term "vertical direction" does not mean in a strict sense, but rather in a range that can be recognized as a vertical direction according to social conventions, and may include an inclination. Similarly, the term "horizontal direction" does not mean in a strict sense, but rather in a range that can be recognized as a horizontal direction according to social conventions, and may include an inclination.

[0093] (2) In the rainwater drainage device 10 of this embodiment, a plurality of inlets 11, vertical pipe sections 13 (an example of a first pipe section), and connections 51, 52 (an example of a first connection section) are provided. The interval Y between adjacent connections 51, 52 is 15 m or less.

[0094] In this way, when rainwater flows into the horizontal piping section 14 from a plurality of inlets 11, the siphon effect can be generated by setting the length between the connections 51, 52 to 15 m or less.

[0095] (3) The rainwater drainage device 10 of this embodiment further includes a vertical pipe section 15 (an example of a third pipe section). The vertical pipe section 15 is connected to a horizontal pipe section 14 (an example of a second pipe section) at a connection section 53 (an example of a second connection section), and is disposed vertically below the horizontal pipe section 14. The length W of the horizontal pipe section 14 from the horizontal pipe section 14 to the connection section 52 closest to the connection section 53 is 15 m or less.

[0096] In this way, even if rainwater flows into the horizontal piping section 14 from multiple inlets 11, the siphon effect can be generated by setting the length W between the connection part 53 and the connection part 52 closest to the connection part 53 to 15 m or less.

[0097] (4) The rainwater drainage device 10 of the present embodiment further includes a siphon induction unit 12. The siphon induction unit 12 is disposed at the inlet 11 and induces the siphon phenomenon.

[0098] This makes it possible to more reliably cause the siphon phenomenon.

[0099] <5. Other embodiments> Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the gist of the invention.

[0100] (A) In the above embodiment, one rainwater drainage device 10 is provided with two sets of an inlet 11, a siphon induction section 12, and a vertical pipe section 13, but this is not limited to two sets, and three or more sets may be provided, or only one set may be provided.

[0101] Fig. 6 is a schematic diagram showing a rainwater drainage device 10' provided with three sets of an inlet 11, a siphon induction section 12, and a vertical pipe section 13. In the rainwater drainage device 10' shown in Fig. 6, an additional set of an inlet 11, a siphon induction section 12, and a vertical pipe section 13 is provided between two sets.

[0102] In this case, the horizontal piping section 14' has, arranged in this order in the horizontal direction, an elbow joint 31, a first pipe 32, a three-way joint 36, a third pipe 37, a three-way joint 33, a second pipe 34, and an elbow joint 35. That is, unlike the horizontal piping section 14 of the embodiment, a three-way joint 36 and a third pipe 37 are further provided.

[0103] Unlike the above embodiment, the end of the first pipe 32 on the vertical pipe section 15 side is connected to a three-way joint 36, and the vertical pipe section 13 is connected to the three-way joint 36 from above. In addition, one end of a third pipe 37 is connected to the three-way joint 36, and the other end of the third pipe 37 is connected to the three-way joint 33.

[0104] As shown in FIG. 6, Y1 is the distance along the horizontal piping section 14' between the connection 51 farthest from the vertical piping section 15 and the connection 54 between the vertical piping section 13 and the horizontal piping section 14' in the middle of the three, and Y2 is the distance along the horizontal piping section 14' between the connection 54 and the connection 52. Similarly to the above embodiment, W is the distance along the horizontal piping section 14' between the connection 52 and the connection 53. In this case, Y1, Y2, and W are set to 15 m or less. Note that Y1 and Y2 do not have to be the same distance as long as they are 15 m or less.

[0105] FIG. 7 is a schematic diagram showing a rainwater drainage device 10″ in which only one set of an inlet 11, a siphon inducing section 12, and a vertical pipe section 13 is provided. In this case, the horizontal pipe section 14″ (an example of a second pipe section) has an elbow joint 31, a first pipe 32, and an elbow joint 35, which are arranged in this order along the horizontal direction. The elbow joint 31 connects the vertical pipe section 13 connected from above to the first pipe 32. The end of the first pipe 32 on the vertical pipe section 15 side is connected to the elbow joint 35, and the elbow joint 35 is connected to the vertical pipe section 15 (an example of a third pipe section). In this case, the distance W of the horizontal pipe section 14″ between the connection section 51 (an example of a first connection section) of the vertical pipe section 13 with the horizontal pipe section 14′ and the connection section 53 (an example of a second connection section) of the horizontal pipe section 14″ with the vertical pipe section 15 is set to 15 m or less.

[0106] In this way, when rainwater flows into the horizontal piping section 14'' from one inlet 11, the siphon effect can be caused by setting the length between connection section 51 and connection section 53 to 15 m or less.

[0107] (B) In the above embodiment, the length L from the inlet 11 of the two vertical piping sections 13 to the horizontal piping section 14 is set to the same length, but as long as a length of 60 cm or more is secured, the length from the inlet 11 of the vertical piping section 13 to the horizontal piping section 14 may be different.

[0108] (C) In the above embodiment, the rainwater drainage devices 10 are provided only on two opposing side surfaces, but they may be provided near all four side surfaces.

[0109] (D) In the above embodiment, the pipes are connected to each other by joints, but this is not limiting, and the pipes may be directly connected to each other.

[0110] (E) In the rainwater drainage device 10 of the above embodiment, a pipe having a circular cross section (flow path cross section) perpendicular to the flow path direction is used, but the shape is not limited to a circle and may be an ellipse, a square, or the like.

[0111] (F) In the above embodiment, the pipe is described as being made of polyethylene, but the present invention is not limited to this. For example, other than polyethylene, other olefin resins such as PP (polypropylene) and other resins such as PVC (vinyl chloride) may be used.

[0112] Furthermore, the pipes are not limited to being made of resin, but may be made of metal.

[0113] (G) In the above embodiment, the joint is described as being made of polyethylene, but the present invention is not limited to this. For example, other than polyethylene, other olefin resins such as PP (polypropylene) and other resins such as PVC (vinyl chloride) may be used.

[0114] Furthermore, the joint is not limited to being made of resin, but may be made of metal. When connecting a metal joint to a pipe, for example, a screw connection, a mechanical joint (for example, a flexible joint), or a flange is used.

[0115] (H) In the above embodiment, the storm water drainage device 10 is disposed inside the building 100, but this is not limiting and the storm water drainage device 10 may be disposed outdoors.

[0116] (I) In the rainwater drainage device 10 of the above embodiment, the siphon induction unit 12 shown in Figures 3(a) and 3(b) is provided, but is not limited to this. Also, if the siphon phenomenon occurs due to conditions such as the shape of the recess 102 or the rooftop 105, the siphon induction unit 12 does not need to be provided.

[0117] (J) In the rainwater drainage device 10 of the above embodiment, the diameter is reduced midway through the vertical pipe section 15, but it does not have to be reduced in diameter. [Industrial Applicability]

[0118] INDUSTRIAL APPLICABILITY The rainwater drainage device of the present invention has the effect of enabling the siphon phenomenon to occur more reliably, and can be used as various types of drainage devices, etc. [Explanation of symbols]

[0119] 10: Rainwater drainage system 11:Inlet 13: Vertical piping section 14: Horizontal piping section 51: Connection part 52: Connection part

Claims

1. An inlet through which rainwater flows in; A first piping section connected to the inlet and arranged along a vertical direction; a second piping section connected to the first piping section at a first connection section and arranged along a horizontal direction; A siphon inducer disposed at the inlet and having a plurality of fins disposed in a radial direction of the inlet, A rainwater drainage device, wherein the length of the first piping section from the first connection section to the inlet is 60 cm or more.

2. An inlet through which rainwater flows in; A first piping section connected to the inlet and arranged along a vertical direction; a second piping section connected to the first piping section at a first connection section and arranged along a horizontal direction; a third piping section connected downstream of the second piping section at a second connection section and disposed vertically; A siphon inducer disposed at the inlet and having a plurality of fins disposed in a radial direction of the inlet, A rainwater drainage device, wherein the length of the second piping section from the second connection section to the first connection section closest to the second connection section is 15 m or less.

3. A rainwater drainage device as described in claim 1 or 2, wherein the siphon inducing portion has a lid portion positioned above the inlet with a gap between the inlet and the siphon inducing portion.

4. The inlet, the first piping section, and the first connection section are provided in plurality, The rainwater drainage device according to claim 1 , wherein the distance between adjacent first connection portions is 15 m or less.

5. A fitting used in at least the first connection part or the second connection part of a storm water drainage device described in any one of claims 1 to 4.

6. A roof equipped with a rainwater drainage device described in any one of claims 1 to 4.

7. A building equipped with a storm water drainage device described in any one of claims 1 to 4.

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